Understanding charge transport in vacuum deposited Schottky organic solar cells with microsecond transient photocurrent measurements

Sibi Sutty; Graeme Williams; Hany Aziz

doi:10.1117/12.2061067

6 October 2014 Understanding charge transport in vacuum deposited Schottky organic solar cells with microsecond transient photocurrent measurements

Sibi Sutty, Graeme Williams, Hany Aziz

Author Affiliations +

Proceedings Volume 9184, Organic Photovoltaics XV; 91841P (2014) https://doi.org/10.1117/12.2061067
Event: SPIE Organic Photonics + Electronics, 2014, San Diego, California, United States

Abstract

Schottky-junction organic solar cells have been a topic of intense research in recent times due to their surprisingly high performance. Some aspects of their device physics are well understood but charge transport in neat-C₆₀ and donor-doped Schottky junction OSCs has not been studied in detail so far. In this study, charge transport in neat-C₆₀ OSCs is examined by studying the performance of these OSCs as a function of C₆₀ active layer thickness. Surprisingly, the fillfactor of the neat-C₆₀ Schottky OSC does not degrade for layer thicknesses between 20 nm – 80 nm indicating that charge transport is not an issue. However, the short-circuit current decreases significantly due to a reduction in the builtin voltage. The dissociation of excitons formed in C₆₀ aggregates is preferentially reduced. Devices with thicker C₆₀ layers and consequently, higher C₆₀ aggregation, were found to have greater recombination. Finally, charge mobility in C₆₀ films with aggregates is found to be lower than charge mobility in films with little to no aggregation.

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Sibi Sutty, Graeme Williams, and Hany Aziz "Understanding charge transport in vacuum deposited Schottky organic solar cells with microsecond transient photocurrent measurements", Proc. SPIE 9184, Organic Photovoltaics XV, 91841P (6 October 2014); https://doi.org/10.1117/12.2061067

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